Synthesis and characterization of stable thiazolylazo anion radical complexes of ruthenium(II) |
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Authors: | Sk Jasimuddin Debasish Guha Thakurata |
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Institution: | (1) Department of Chemistry, Assam University, Silchar, 788011, Assam, India |
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Abstract: | Two stable thiazolylazo anion radical complexes of ruthenium(II), Ru(L1•−)(Cl)(CO)(PPh3)2] (1) and Ru(L2•−)(Cl)(CO)(PPh3)2] (2) (where L1 = 2′-Thiazolylazo-2-imidazole and L2 = 4-(2′-Thiazolylazo)-1-n-hexadecyloxy-naphthalene), have been synthesized
and characterized by spectroscopic and electrochemical techniques. The radical nature of the complexes has been confirmed
from their room temperature magnetic moments and X-band ESR spectra. The radical complexes display a moderately intense (ε ~ 104 M−1 cm−1) and relatively broad band in 430–460 nm region. In the microcrystalline state, complexes (1) and (2) display strong ESR
signals at g = 1.951 and g = 1.988, respectively. In CH2Cl2 solution, complexes (1) and (2) show a quasireversible one-electron response near −0.64 and −0.59 V, respectively, versus
Ag/AgCl due to the radical redox couple RuII(L)(Cl)(CO)(PPh3)2]/RuII (L•−)(Cl)(CO)(PPh3)2]. |
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